I would have thought that would be ok.  You might end up with a harmless corner left on your pads though.  Wouldn't think that would be a problem unless the pads wear so much that the remaining corners that haven't worn touch one another stopping your pads from moving properly.

 Easy just to sand it iff it it needs it though.

What about these? I use this with my juicy, absolutely spot on, clears well, doesn't eat pads, low cost, no funny braking sensations, etc, etc...

If the pad overhangs the rotor it can cause hassle, my oro 180mm setup was out of alignment due to the bracket and left a portion of the pad overhanging which caused the pads to wear tapered then made the pistons sticky as they were lop-sided in their holes, as well as a funny lever feel and delayed action, this went away when I changed to 200mm and the bracket was made correctly meaning full coverage of the rotor.